oxnas: re-add support for kernel 3.14

This reverts commit c81ddddde5fd193802d511b42eb7b108aac17136 on
https://gitorious.org/openwrt-oxnas/openwrt-oxnas.git


which removed patches and config for 3.14.

[arm_introduce-dma-fiq-irq-broadcast patch was renamed to match 3.18]

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

SVN-Revision: 43520